/*
 * Copyright 2021 spring-boot-extension the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.livk.caffeine.handler;

/**
 * <p>
 * CacheHandler
 * </p>
 *
 * @author livk
 */
public interface CacheHandler<T> extends CacheReadHandler<T>, CacheWriteHandler<T> {

	default T readAndPut(String key, T defaultValue) {
		T t = this.read(key);
		if (t == null) {
			synchronized (this) {
				t = this.read(key);
				if (t == null) {
					t = defaultValue;
					this.put(key, t);
				}
			}
		}
		return t;
	}

}
